Once you see the mocap skeleton in Motion
Builder - characterize (have your actor stand in a t-pose).

Go to the characters section and expand it. Find the
character icon (circled in red).
Drag this icon to the hips of the mocap skeleton. Go ahead and
click "characterize" and select "biped".

Now select a character to drive. For example,
Gremlin, which you will find under the Tutorials folder.
Be careful to pick one that is characterized (or set up your
own). ie. mia_characterize, Aragor, Gremlin etc.
Drag Gremlin to the view port - a dialogue box will pop up.
Select fbx merge, all takes.
Alternatively, you can grab characters from the file menu using
the option Merge.

In Monty, you will use the ClipArt Characters

Now drive Gremlin by selecting him in the
Navigator window and changing his Input Type and Source to
Character. With active checked Gremlin will now follow the
movement of the person in the suit.

Trouble shooting with live streaming:

make sure your cameras are connected

make sure you have a character loaded
(try deleting and reloading in the character management
menu)

make sure live streaming is checked on
(under editors)

make sure you have solve selected

make sure you characterize your actor
FIRST and that they are in T-POSE

if it gets wacky, try clicking on and off
Server Active - this sometimes resolves issues, otherwise,
start the motion builder portion of it over

NOTE: Streaming is much more stable in 3.1 /
3.3.1 compared to 1.7.

Offline
Streaming

NOTE: Most often you will be live streaming.
When offline streaming you may need to trouble shoot in
Motion Builder 2016.
In blade ensure Server Active and Stream Offline
Data are both checked.The offline
data must be playing in blade when you stream offline***In Motion Builder 2016, click online, then
create bones and then check on stream bones (if it is already on
and you do not see anything appearing in the viewport you
may need to toggle it off and on. If that fails, toggle online)